As an American, I completely understand why many non-Americans look upon our citizenry with disdain. I admit, I often look down upon this country, too.
Many Americans are exceedingly cocky, self-entitled, lazy, xenophobic, condescending, ignorant, and hypocritical. It's the proverbial melting pot of douchebaggery.
On a more political side, Americans are seen as ineffective "World Policers." In the past few decades, the USA has deteriorated tremendously, in regards to global stature and garnered respect. We used to be the best and the brightest, but our American educational system isn't as competitive as it once was. Our military used to be a force to be reckoned with, but it's proven ineffective in this new age of anti-terror campaigns. We haven't won a real war since WWII, and NO, Desert Storm doesn't count, as we're still in the midst of Desert Storm Vol. 2 - Operation Iraqi Freedom (remix).
Side Note: I was in Europe during the USA's 2008 Presidential elections, and I was shocked by the extent of news coverage it got. So I think people in other countries still look to the USA as a world leader. But, herein lies another issue. The world knows who Barack Obama is. They knew who George W. Bush was. I'd SERIOUSLY doubt if most American can name the President or leader of ANY other country. There is a disconnect between Americans and the rest of the world. Global interest and awareness is not reciprocated by us.
It's all quite humorous, actually. Think about it. The world's favorite sport is football (soccer for those of you..). But here in the USA, we have no qualms about calling it a sport for queers. We then create a different sport all together, and name it... what else.. football. But since we can't have two different sports with the same name, we change the name of the original football to "soccer", but we might as well have changed it to fagball. And in February, when the championship "football" game is decided, we call ourselves "World Champions" as if we had actually played any other country, let alone the world. Seems absurd, but to us it makes perfect sense. You see, we ARE the world... some people like to think.
America is a nation so smothered by its own hypocrisy that I'm surprised we're still standing. The land of freedom, built on a foundation of racism and slavery.